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pandas read_csv


Sharan
I had similar issue of reading different column sized csv file... Instead
of using pandas I used csv reader which handles with no error...
Regards
Venkat

On Fri, 9 Nov 2018, 8:28 pm Sharan Basappa, <sharan.basappa at gmail.com>
wrote:

> are there any requirements about the format of the CSV file when using
> read_csv from pandas?
> For example, is it necessary that the csv file has to have same number of
> columns in every line etc.
>
> I am trying to load a csv file and I get the following error.
> I really don't know what the issue is ...
> Any help is appreciated ...
>
> ParserErrorTraceback (most recent call last)
> D:\Projects\Initiatives\machine learning\programs\log\log_analysis_1.py in
> <module>()
>      10
>      11 #data_df = pd.read_csv("BGL_MERGED.log", nrows=100, header=None,
> delimiter=r'\s"')
> ---> 12 data_df = pd.read_csv("d:\Projects\Initiatives\machine
> learning\programs\log\BGL_MERGED.log", nrows=100, header=None)
>      13 logger.debug("data frame %s \n", data_df)
>      14 print('Cols %d' %(len(data_df.columns)))
> D:\Users\sharanb\AppData\Local\Enthought\Canopy\edm\envs\User\lib\site-packages\pandas\io\parsers.pyc
> in parser_f(filepath_or_buffer, sep, delimiter, header, names, index_col,
> usecols, squeeze, prefix, mangle_dupe_cols, dtype, engine, converters,
> true_values, false_values, skipinitialspace, skiprows, nrows, na_values,
> keep_default_na, na_filter, verbose, skip_blank_lines, parse_dates,
> infer_datetime_format, keep_date_col, date_parser, dayfirst, iterator,
> chunksize, compression, thousands, decimal, lineterminator, quotechar,
> quoting, escapechar, comment, encoding, dialect, tupleize_cols,
> error_bad_lines, warn_bad_lines, skipfooter, skip_footer, doublequote,
> delim_whitespace, as_recarray, compact_ints, use_unsigned, low_memory,
> buffer_lines, memory_map, float_precision)
>     653                     skip_blank_lines=skip_blank_lines)
>     654
> --> 655         return _read(filepath_or_buffer, kwds)
>     656
>     657     parser_f.__name__ = name
> D:\Users\sharanb\AppData\Local\Enthought\Canopy\edm\envs\User\lib\site-packages\pandas\io\parsers.pyc
> in _read(filepath_or_buffer, kwds)
>     409
>     410     try:
> --> 411         data = parser.read(nrows)
>     412     finally:
>     413         parser.close()
> D:\Users\sharanb\AppData\Local\Enthought\Canopy\edm\envs\User\lib\site-packages\pandas\io\parsers.pyc
> in read(self, nrows)
>    1003                 raise ValueError('skipfooter not supported for
> iteration')
>    1004
> -> 1005         ret = self._engine.read(nrows)
>    1006
>    1007         if self.options.get('as_recarray'):
> D:\Users\sharanb\AppData\Local\Enthought\Canopy\edm\envs\User\lib\site-packages\pandas\io\parsers.pyc
> in read(self, nrows)
>    1746     def read(self, nrows=None):
>    1747         try:
> -> 1748             data = self._reader.read(nrows)
>    1749         except StopIteration:
>    1750             if self._first_chunk:
> pandas/_libs/parsers.pyx in pandas._libs.parsers.TextReader.read
> (pandas\_libs\parsers.c:10862)()
> pandas/_libs/parsers.pyx in
> pandas._libs.parsers.TextReader._read_low_memory
> (pandas\_libs\parsers.c:11343)()
> pandas/_libs/parsers.pyx in pandas._libs.parsers.TextReader._read_rows
> (pandas\_libs\parsers.c:11884)()
> pandas/_libs/parsers.pyx in pandas._libs.parsers.TextReader._tokenize_rows
> (pandas\_libs\parsers.c:11755)()
> pandas/_libs/parsers.pyx in pandas._libs.parsers.raise_parser_error
> (pandas\_libs\parsers.c:28765)()
> ParserError: Error tokenizing data. C error: Expected 1 fields in line 8,
> saw 3
> --
> https://mail.python.org/mailman/listinfo/python-list
>